Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Beginning Balance	[1]	$ 2,394.8	$ 2,090.2
Translation adjustments		(1.1)	3.7
Acquisition-related adjustments		71.4	300.9
Ending Balance	[1]	2,465.1	2,394.8
Plumbing [Member]
Goodwill [Line Items]
Beginning Balance	[1]	750.1	747.3
Translation adjustments		(1.3)	2.8
Acquisition-related adjustments		65.3
Ending Balance	[1]	814.1	750.1
Outdoors & Security [Member]
Goodwill [Line Items]
Beginning Balance	[1]	718.6	417.4
Translation adjustments		0.1	0.3
Acquisition-related adjustments		6.1	300.9
Ending Balance	[1]	724.8	718.6
Cabinets [Member]
Goodwill [Line Items]
Beginning Balance	[1]	926.1	925.5
Translation adjustments		0.1	0.6
Ending Balance	[1]	$ 926.2	$ 926.1

[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.